Low-energy electron collisions with ethane

Abstract

We employed the Schwinger multichannel method to compute elastic cross sections for low-energy electron collisions with ethane (C 2 H 6 ). The calculations were carried out in the static-exchange and static-exchange plus polarization approximations for energies up to 12 eV. Our integral cross section shows good agreement with experimental data and with theoretical results for energies above 5 eV. There are some differences for energies below 5 eV between our results and the available experimental and theoretical results. Our differential cross sections also agree well with the experiment and with theory for energies above 5 eV; below this energy our results agree in shape, but are smaller than the available experimental and theoretical results. We discuss possible reasons for these discrepancies. We found a broad structure in the integral cross section around 8.5 eV and also a Ramsauer-Townsend minimum around 0.2 eV. These results are in agreement with the experimental observations and theoretical results.

Collisions of low-energy electrons with isopropanol

“…However, the differential cross sections (DCSs) of the straight-chain molecules, namely ethanol, n-propanol, and n-butanol, show an f -wave scattering pattern between 5 to 10 eV, while branched systems such as isobutanol, t-butanol, and 2-butanol show a d-wave pattern. Similar behavior was also seen in alkanes [4][5][6][7][8][9][10][11][12]. These results suggest that the DCS of isopropanol (propan-2-ol or isopropyl alcohol), the branched isomer of C 3 H 7 OH, should also exhibit a d-wave pattern.…”

Differential elastic electron scattering by pentane

“…Ignition and reaction chemistry involving excitation, dissociation, and ionization of these molecules in combustion (plasma) processes in automobile engines [3] is governed or catalyzed by energetic electron scattering from these fuel species in the energy region which ranges from 0.1 eV to high energies (>100 eV), but with a maximum around 10 eV [4]. Whereas there exist electron impact data on methane [5][6][7], ethane [8,9], propane [10][11][12], and butane [13], and in references cited within these, there is lack of electron collision data for pentane. The few data available for pentane are those by Freeman et al [14] of total electron cross sections determined from the mobility of electrons in liquid pentane at the energies of 0.1 to 0.5 eV using a time-of-flight method and those by Kimura et al [15] of gaseous pentane of total cross sections for this target.…”

Scattering of e± by C2H6 Molecule over a Wide Range of Energy: A Theoretical Investigation

“…Figure 12 and Figure 13 present the calculations for the TCS, TICS, IECS, INCS, MTCS, and VCS for – scattering in the energy range 1 eV–1 MeV using the IAM and IAMS in the framework of the OM potential. The calculated scattering observables for electron scattering were compared with the experimental measurements of Floeder et al [ 19 ], Sueoka and Mori [ 21 ], Nishimura and Tawara [ 25 ], Ariyasinghe and Powers [ 29 ], Szmytkowski and Krzysztofowicz [ 26 ], Grill et al [ 35 ], Duric et al [ 36 ], Tian and Vidal [ 37 ], Schram et al [ 38 ], Chatham et al [ 69 ], Nishimura and Tawara [ 39 ], Rawat et al [ 23 ], Tanaka et al [ 22 ], and Shishikura et al [ 40 ]; and the theoretical calculations of Joshipura and Vindkumar [ 42 ], Jin-Feng et al [ 43 ], Vinodkumar et al [ 44 ], Rawat et al [ 23 ], Hwang et al [ 45 ], Mayol and Salvat [ 70 ], Bettega et al [ 33 , 41 ], Sun et al [ 32 ], and Hayashi [ 46 ]. As is evident from Figure 12 a,c–f, the calculated TCS, IECS, INCS, MTCS, and VCS using the IAM overestimate the experimental data, particularly at lower electron energies than those using the IAMS and other studies.…”

“… DCS for the elastic scattering of electrons from at energies of 17.5, 20, 40, 60, 80, and 100 eV. Theoretical works: IAM, IAMS, Rawat et al [ 23 ] and Bettega et al [ 41 ]; Experimental works: Curry et al [ 20 ], Tanaka et al [ 22 ], Rawat et al [ 23 ], and Fink et al [ 16 ]. …”

“…Bettega et al [ 33 ] theoretically investigated the DCS and IECS for electron scattering from , , , and from 5 to 30 eV using an ab initio Schwinger multichannel method (SMC) with pseudopotentials. In another work, Bettega et al [ 41 ] calculated the elastic DCS and IECS for low-energy electron scattering up to 12 eV employing the same SMC including the polarization effect with the pseudopotential. The TCS and inelastic cross-sections (INCS) for – scattering were theoretically studied by Joshipura and Vinodkumar [ 42 ] at collision energies = 50–5000 eV using optical model potential (OPM) with the additivity rule (AR), wherein the molecular cross-section was an incoherent sum of the cross-sections of the constituent atoms.…”